CVE-2018-16151
Publication date 24 September 2018
Last updated 25 August 2025
Ubuntu priority
Description
In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| strongswan | 18.04 LTS bionic |
Fixed 5.6.2-1ubuntu2.2
|
| 16.04 LTS xenial |
Fixed 5.3.5-1ubuntu3.7
|
|
| 14.04 LTS trusty |
Fixed 5.1.2-0ubuntu2.10
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
7.5 · High
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
Related Ubuntu Security Notices (USN)
- USN-3771-1
- strongSwan vulnerabilities
- 25 September 2018